In ancient my country, people invented methods of food preservation and preservation. There are records in the Book of Songs that slaves dug ice in winter to store it for nobles to drink in summer. The ancient book "Zhou Rites" records "Sacrifice to *** Bingjian". "Jian" is actually a box with ice in it, and food is placed in the middle of the ice to preserve food. It can be seen that Jian is the ancestor of refrigerators in our country. In 1978, a "bronze ice mirror" was unearthed from the tomb of Zeng Hou Yichu in Suixian County, Hubei Province. It is a double-layered vessel, with a square pot inside the square mirror. In summer, ice can be placed between the bowl and the wall of the pot, and wine can be placed inside the pot. The ice can cool the wine. It can be said that the Tongbingjian is the earliest refrigerator discovered in the world so far. At the end of the 19th century, an American named Jacobi was working in England. Perkins made a discovery that led to the invention of the refrigerator. In 1834 he discovered that when certain liquids evaporate, there is a cooling effect. Perkins asked a team of mechanics to create a working model that would prove the idea. Soon, household refrigerators became smaller and more easily accessible in the kitchen. Sure enough, the device actually produced some ice one night. The mechanics excitedly took the ice, jumped into a carriage, and drove quickly to Perkins' house to show him the results. One of the most important uses of refrigerators is on ships. Large refrigerated warehouses meant that ships could carry fresh meat on long voyages, such as lamb, which could be exported from New Zealand to Europe. Perkins was by this time old and was not selling his invention on the market. The life of the man who sold inventions was a Scottish printer named John Harrison in Australia. It is possible that Harrison discovered the cooling effect without knowing anything about Perkins' results. He used ether to clean metal printing type and one day noticed the cooling effect of the substance. By 1862, his first refrigerators were on the market. Harrison also set up the first refrigeration workshop at a brewery in Bendigo, Victoria. German engineer Carl von Linde built the first household refrigerator in 1879.
Answer 2: The refrigerator was invented by Pradhan and Miaota. Four thousand years ago, people in Mesopotamia knew how to store meat in caves filled with ice. Around 1850, the first household freezer launched in the United States also used natural ice cubes and did not achieve the freezing effect. The first refrigerator was invented and manufactured by Sweden's Pladen and Miaota in 1923. The first refrigerator to use fluorochlorine gas as refrigerant was invented in the United States in 1930. In the 1930s and 1940s, refrigerators with freezers became common in the first households in the United States. With the gradual improvement of living standards, refrigerators have become a very common electrical household appliance.